Discussion
Which process describes a parcel rising without exchanging heat?
Answer: A
Vertical motion in the atmosphere is rapid enough compared with radiative and conductive heat exchange that it is very nearly adiabatic, which is why the dry adiabatic lapse rate is such a good approximation. The parcel does work against its surroundings as it expands, and that work comes from its internal energy, which is why it cools. Neither temperature, pressure nor volume is held constant. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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